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Silicon thin film anode for lithium secondary battery and preparation method thereof

a lithium secondary battery and thin film anode technology, which is applied in the field of lithium secondary battery thin film anode and a preparation method thereof, can solve the problems of complicated conventional structure and preparation methods, and achieve the effect of enhancing capacity and cycle characteristics of the battery

Active Publication Date: 2009-03-05
KOREA INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]Therefore, it is one object of the present invention to provide a silicon thin film anode for a lithium secondary battery capable of enhancing a capacity and cycle characteristics thereof.
[0009]It is another object of the present invention to provide a preparation method for a silicon thin film anode for a lithium secondary battery capable of enhancing a capacity and cycle characteristics of a silicon thin film anode.
[0010]It is still another object of the present invention to provide a lithium secondary battery having a silicon thin film anode capable of enhancing a capacity and cycle characteristics of a silicon thin film anode.

Problems solved by technology

However, the conventional structures and preparation methods are complicated.

Method used

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  • Silicon thin film anode for lithium secondary battery and preparation method thereof
  • Silicon thin film anode for lithium secondary battery and preparation method thereof
  • Silicon thin film anode for lithium secondary battery and preparation method thereof

Examples

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example 1

[0071]In the example 1, an anode active material layer was formed of only a silicon thin film, and the metallic buffer layer of FIG. 1 was not formed.

[0072]Firstly, a collector formed of a copper foil was prepared. Then, an anode active material layer (silicon thin film) was deposited on the collector by an RF magnetron sputtering process using a silicon target having a purity of 99.9%. Here, the silicon thin film was deposited to have a thickness of 500 nm. The thickness of the silicon thin film was observed by using an atomic force microscope (AFM) or an alpha step surface profiler, etc. In order to enhance an interface characteristic between deposited layers, the deposited thin film anode underwent an annealing process in an argon atmosphere by using a rapid thermal analyzer (RTA). The annealing process was performed for 20 minutes at a temperature of 400° C. having initially raised for 5 minutes. Then, the temperature of 400° C. drastically dropped to 25° C. Next, the annealing ...

example 2

[0077]In the example 2, a metallic buffer layer was formed, and an anode active material layer was formed of only a silicon thin film.

[0078]Firstly, a metallic buffer layer (titanium thin film layer) having a thickness of 50 nm was deposited on a collector by an RF magnetron sputtering process using a titanium target having a purity of 99.9%. Then, an anode active material layer (silicon thin film) was deposited with a thickness of 500 nm on the metallic buffer layer. The deposited silicon thin film anode underwent an annealing process and a carbon coating process in the same manner as the example 1. Then, in order to observe a performance and cycle characteristics of the prepared silicon thin film anode, a half cell assembly is performed in the same manner as the example 1.

example 3

[0083]In the example 3, a metallic buffer layer was not formed, and an anode active material layer was formed of a silicon-metal single layer to undergo an annealing process.

[0084]More concretely, silicon and titanium were simultaneously deposited on a collector formed of copper by using a silicon target and a titanium target, thereby depositing an anode active material layer (silicon-metal single layer) having a thickness of 500 nm. Then, the deposited silicon thin film anode underwent an annealing process and a carbon coating process in the same manner as the example 1, thereby performing a half cell assembly. When the anode active material layer was formed of a silicon-metal single layer, a metallic component was distributed into a silicon thin film uniformly enough to approximately correspond to an alloy. Accordingly, conductivity lowering due to volume change of the silicon thin film was minimized. That is, even if the silicon thin film was broken, a conductivity of the silicon...

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Abstract

Disclosed are a silicon thin film anode for a lithium secondary battery having enhanced cycle characteristics and capacity and a preparation method thereof. A preparation method for a silicon thin film anode for a lithium secondary battery, comprises: preparing a collector including a metal; forming an anode active material layer including a silicon on the collector; forming one or more interface stabilizing layer, by annealing the collector and the anode active material layer under one of an inert atmosphere, a reduced atmosphere, and a vacuum atmosphere to react a metallic component of at least one of the collector and the anode active material layer with a silicon component of the anode active material layer at an interface therebetween; and forming a carbon coating layer on the anode active material layer by performing an annealing process in a hydrocarbon atmosphere.

Description

RELATED APPLICATION[0001]The present invention claims priority from Korean Application No. 10-2007-0086699, filed on Aug. 28, 2007, which is herein expressly incorporated by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a silicon thin film anode for a lithium secondary battery and a preparation method thereof, and more particularly, to a silicon thin film anode for a lithium secondary battery having enhanced cycle characteristics and capacity and a preparation method thereof.[0004]2. Description of the Background Art[0005]Among secondary batteries, a lithium battery is being most spotlighted due to its high energy density and light weight. Especially, a lithium secondary battery is being mainly used in portable electronic appliances such as a mobile phone and a notebook. As IT technologies are continuously developed domestically or in foreign countries, demands for the lithium secondary battery in the futur...

Claims

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Application Information

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IPC IPC(8): H01M4/64C23C14/35H01M4/58H01M4/583H01M10/052H01M10/36
CPCH01M4/366H01M4/38Y02E60/122H01M10/052H01M4/583H01M4/386H01M4/387Y02E60/10H01M4/134H01M4/1395H01M10/058
Inventor KIM, HYUNG-SUNCHO, BYUNG-WONCHUNG, KYUNG-YOONLEE, JOONG-KEEKANG, TAEG-KWANJUNG, YOUNG-HWAN
Owner KOREA INST OF SCI & TECH
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